Abstract:
:Ultrasonic coda wave analysis techniques localize defects in fields such as seismography and nondestructive testing. In medical ultrasound, these techniques might provide novel mapping of tissue properties in diseases characterized by local fibrosis. In this work, we present an approach for localizing variation in scattering properties in the diffuse regime with an array transducer in medical ultrasound. This approach estimates coda wave decorrelation as the array is displaced by 0.5 mm, allowing data acquisition at two slightly different spatial locations. An inverse problem is solved as in nondestructive testing based on coda wave decorrelation estimates and a locally-estimated diffusion constant. The developed approach is demonstrated in a tissue-mimicking phantom to assess sensitivity to variation in scattering properties. Next, the ability of the approach for localizing regions of increased multiple scattering in biological tissues is assessed with a large multiple scattering bead in an ex vivo porcine cardiac sample. Through these experiments, the ability to map variation in multiple scattering is demonstrated for the first time, with a mean localization error of 1.42 ± 3.5 mm for this low-resolution mapping technique. While the goal of this technique is to map defects in the diffuse regime rather than to develop a conventional image, contrast ratios in the resulting images were in good agreement with scattering concentrations in phantom studies: 1.98 ± 0.05 for a 2× scattering target, 1.37 ± 0.02 for a 1.4× scattering target, 0.65 ± 0.02 for a 0.7× scattering target, and 0.49 ± 0.03 for a 0.5× scattering targets.
journal_name
Ultrason Imagingjournal_title
Ultrasonic imagingauthors
Lindsey BD,Collins GCdoi
10.1177/0161734619899885subject
Has Abstractpub_date
2020-01-01 00:00:00pages
41-52issue
1eissn
0161-7346issn
1096-0910journal_volume
42pub_type
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
pub_type: 杂志文章
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
pub_type: 杂志文章
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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journal_title:Ultrasonic imaging
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